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efficacious

See definition of efficacious on Dictionary.com

synonyms for efficacious

  • effective
  • effectual
  • active
  • adequate
  • capable
  • competent
  • energetic
  • influential
  • operative
  • potent
  • powerful
  • puissant
  • serviceable
  • strong
  • successful
  • useful
  • virtuous
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antonyms for efficacious

MOST RELEVANT
  • impotent
  • incapable
  • unproductive
  • useless
  • weak
  • inefficacious
  • inefficient
  • unsuccessful
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

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What are other ways to say efficacious?

The adjective efficacious suggests the capability of achieving a certain end: an efficacious plan, medicine. Effectual is used especially of that which produces the effect desired or intended, or a decisive result: An effectual bombardment silenced the enemy. Effective is applied to a person or a thing that has the power to, or which actually does, produce an effect: an effective boss, remedy, speech. Efficient (applied also to persons) implies the skillful use of energy or industry to accomplish desired results with little waste of effort: efficient methods; an efficient manager. 

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How to use efficacious in a sentence

It’s a huge ask of a drug that it be so safe and so efficacious that you can give it to everybody.
WHY IT’S STILL SO HARD TO FIND TREATMENTS FOR EARLY COVID-19TINA HESMAN SAEYJULY 27, 2021SCIENCE NEWS
By early 2020, we had a tremendous amount of data showing that in the mouse model that we had developed, these mRNA spike vaccines were really efficacious in protecting against lethal MERS-CoV infection.
“WE NEVER CREATED A SUPERVIRUS.” RALPH BARIC EXPLAINS GAIN-OF-FUNCTION RESEARCH.ROWAN JACOBSENJULY 26, 2021MIT TECHNOLOGY REVIEW
In a release on May 25, Moderna says its vaccine is safe and efficacious among 12- to 18-year olds.
MODERNA SAYS ITS COVID-19 VACCINE IS SAFE AND WORKS FOR TEENSALICE PARKMAY 25, 2021TIME
If the studies show the new vaccine could be stable and efficacious at refrigerated temperatures, that could increase the number of places that could vaccinate with Moderna’s shot.
MODERNA IS TESTING A NEW VERSION OF ITS COVID-19 VACCINE THAT WOULDN’T REQUIRE ULTRA-COLD STORAGEALICE PARKAPRIL 29, 2021TIME
Several days later, however, the company issued another press release including additional data that showed the vaccine is 76% efficacious in protecting people from disease.
VACCINE SAFETY BOARD CHIDES ASTRAZENECA FOR USING 'OUTDATED' DATA IN PRESS RELEASE ABOUT ITS COVID-19 SHOTALICE PARKMARCH 23, 2021TIME
In the trial, the two-dose shot—developed by the British-Swedish multinational pharmaceutical company in conjunction with Oxford University—was also 100% efficacious in protecting people from severe symptoms and hospitalization from the disease.
ASTRAZENECA'S U.S. STUDY MAY ANSWER SOME OF THE LINGERING QUESTIONS ABOUT ITS VACCINEALICE PARKMARCH 22, 2021TIME
The first dose of the Moderna shot was 92% efficacious after two weeks.
SHOULD THE US START PRIORITIZING FIRST VACCINE DOSES TO BEAT THE VARIANTS?NIALL FIRTHMARCH 2, 2021MIT TECHNOLOGY REVIEW
Some have already raised questions about Johnson & Johnson’s preliminary results, asking why people would take a vaccine that’s only 72 percent efficacious in the United States when the Pfizer and Moderna vaccines are 95 percent efficacious.
HERE’S WHY VACCINES CAN END OUR COVID NIGHTMARELEANA WENFEBRUARY 5, 2021WASHINGTON POST
The funny thing about a global pandemic is that you don’t have a control group, so we won’t ever know exactly how efficacious it was.
PEOPLE ARE FINALLY DOWNLOADING COVID-19 EXPOSURE NOTIFICATION APPS. WILL THEY MAKE A DIFFERENCE?ALEJANDRO DE LA GARZADECEMBER 14, 2020TIME
If you think of influenza vaccines, they are around 50% efficacious.
MODERNA’S COVID-19 VACCINE IS 94.5% EFFECTIVE. HERE’S WHAT THAT REALLY MEANSALICE PARKNOVEMBER 17, 2020TIME
SYNONYM OF THE DAY
OCTOBER 26, 1985
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WORDS RELATED TO EFFICACIOUS

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.